Fuel burning apparatus



Nov. 26, 1935. c. E. LUCKE y FUEL BURNING APPARATUS Filed (NOV. `14,1930 e Sheets-sheet 1 ,lill/[111111111111111 lill/11111111111 u INVENTOR/M@ f M ATTORN EY c. EL LUcKE 2,022,427

FUEL BURN ING APPARATUS Nov. 26, 1935.

6 Sheets-Sheet 2 Filed Nov. 14, 1930 KME@ n@ BY f 'ATToRnrgYf y i NOV.26, 1935. Ei LUCKE 2,022,427

FUEL BURNING APPARATUS Filed Nov.` `14, 1930 6 Sheets-Sheet 5 Flea.

' INVENToR /,/w @M Nov. 26, 1935. C, E LUCKE 2,022,427

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C. E. LUCKE FUEL BURNING APPARATUS Filed Nov. 14, 1930 6 Sheets-Sheet 5x Mln e i i i ATTORNEY c. E. LUCKE 2,022,427

Filed Nov. l14, 1950 6 Sheets-Sheet 6 Nov. 26, 1935.v

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Patented Nov. 26, 1935 UETED STATE FUEL BURNING APPARATUS Charles E.Lucke, New York, N. Y., assignor to Fuller Lehigh Company, Fullerton,Pa., a corporation of Delaware Application November 14, 1930, Serial No.495,562.

4 Claims.

This invention relates to a fuel burner for burning fuel, such. aspulverized coal, in two stages, one of which is in. a casing into whichhot secondary air is introduced, and the other is in the .fj furnaceproper.

The invention will be understood from the clescriptionin connection withthe accompanying drawings, in which Fig. 1 is a horizontal sectionthrough an illustrative embodiment of a device l for carrying out theinvention; Fig. 2` is a similar section showing a modification; Fig. 3is a View from the inside of the furnace taken along the line 3 3 ofFig. 2; Fig. 4 is a horizontal section similar to Figs. 1 and 2 takenalong the l5 line 4-4 of Fig. 6, showing another modifica-I tion; Fig. 5is a View from the inside of the furnace taken along the line 5 5 ofFig. 4, and Fig. 6 is a section along the line G- of Fig. 4.

In the drawings, reference character I indicates a fuel burner of thetype that has a wide thin opening therethrough to cause the fuel insuspension and primary air to assume the form of a thin sheet. It isprovided with ribs 2 .along the outside thereof to increase the rate ofradiation of heat therefrom and keep it cool. Lips 3 are provided at theexit end of the nozzle of the burner, these lips being bent alternatelyto opposite sides to direct streams of fuel and primary air in staggeredstreams to opposite sides.

The burner I projects the fuel and primary air into a secondary aircasing or precombustion chamber 4, the walls of which are lined withheatinsulating material 5 to protect the outer metal shell. Thesecondary air casing 4 may be provided with combustion air at asufciently high temperature to cause ignition of the fuel that entersthe casing 4 from the burner I. In the embodiments. of the inventionillustrated in Figs. 1 and 2, the outer walls of the secondary air cas-ving 4 are disposed at'an oblique angle to the burner I and the innerwalls are substantially at right-angles to the outer walls and arelocated at an oblique angle to the wall of the side of the furnace whichthe fuel enters.

The fuel and primary air passing through the wide thin opening 6 of theburner I enter the casing 4 in different directions at differentelevations along the opening as portions of the vwide stream arediverted by the oppositely inclined lips 3 at the exit of the burner I.

The furnace which the fuel enters from the secondary air casing 4 isprovided with a' Wall comprising .a row of water wall tubes I lined withtile or blocks 8. The size or volume of the precombustion chamber issmaller than that of the furnace, as shown in Figs. l, 2 and 4.* Two ofthe water tubes near the center line of the burner I are bent outwardlyas indicated at Ii), and the two water tubes next to them are bentinwardly as indicated at II. Spaced blocks. or tile I2 are 5 installedbetween each tube til and the adjacent tube l, the blocks on oppositesides of the pair of tubes la being staggered so that staggered 'oortsI3 are provided on opposite sides of the pair of tubes ll from thecasing il into the furl() nace. The tubes I I being bent as indicated,leave wide spaces and are also in position to aid in guiding thestaggered streams of fuel and air into the furnace, so that 'they crosseach other. A row oi' blocks or tile iii is connected to the 15 tubes I0to close the space between. them.

The fuel and primary air enter the secondary air casing v4 and when thesecondary air is at the ignition temperature, ignition begins in thiscasing and is completed after the products pass 20' through the ports I3between the blocks or tile i2. The secondary air is heated in any knownor convenient manner (not illustrated) and is carried into the.pre-combustion chamber from below as illustrated in Figure 6. 25

In the modification shown in Fig. 2, the burner I1 is surrounded by awater jacket I5 and is kept cool by means of the water in this jacket,the remainder of the elements shown in this modification, being the sameas those .already described. 30

In the modification shown in Figs. 4, 5 and 6,

a single tube I8 is left in place in the wall of the furnace along thecenter line of the burner I2 and a tube I!) on each side of the tube I8is bent inwardly .as indicated, with the next tubes 20 on 35 each sidebent outwardly as indicated. Spaced blocks 2I are installed between thetubes I8 and 20 on each side so as to leave staggered ports 22 onopposite sides of the tube I8 from the casing 42 into the furnace. 40

A row of blocks 23 is installed along the tubes I9 to close the spacebetween them.

Spaced blocks or tile 24 corresponding to the blocks or tile 2| areinstalled between the tubes I9 and the first unbent tube I in the row offur- 45 nace wall tubes and a block or tile 25 is installed between thetubes I8 and It at one side of each port 22 and the tubes 2E) and 'i' atthe other side of the port, thus forming the side walls of the ports 22.50

In the modification shown in Figs. fi, 5 and 6, the outer wall 26 of thecasing 42 is perpendicular to the burner I2 and is provided with anopening 2'I through which the fuel and primary air enter the casing 42.The ports 22 are so 55 disposed that -the products passing from thecasing 42 into the furnace enter the furnace along diverging staggeredstreams instead of converging streams as described in the othermodification.

The fuel burners or nozzles in any of the embodiments of the inventionmay be cooled either by means of the ribs in air or water jackets may beused. The bent lips 3 in Figs. 1 and 2 prevent radiant heat fromentering the nozzle, and since the radiant heat from the furnace in Fig.3 enters the secondary air casing at an angle, it cannot pass into thefuel nozzle.

I claim:

1. In combination, a furnace wall having a vertical series of staggeredports therein, refractory walls forming an external pre-combustionchamber having one side thereof registering with said furnace Wallports, an opening formed in one of said chamber walls for the entry ofhigh temperature air for combustion, and an elongated fuel burner nozzlearranged to discharge into said chamber through a chamber wall spacedfrom said furnace wall and having a vertical series of staggereddiverging discharge tips corresponding in elevation to said furnace wallports. v

2. In combination, a furnace wall having a row of spaced cooling tubesassociated therewith and refractory material arranged to close theintertube spaces, certain of said cooling tubes having refractorymaterial omitted from therebetween to form a restricted port in saidfurnace wall, refractory walls forming an external precombustion chamberhaving one side thereof registering with said furnace wall port, anopening formed in one of said chamber walls for the entry of hightemperature air for combustion, and a fuel burner nozzle arranged todischarge into said chamber through a chamber wall spaced from saidfurnace wall.

3. In combination, a wall having a row of spaced cooling tubesassociated therewith, and refractory material arranged to close theintertube spaces, certain of said cooling tubes being bent andrefractory material omitted from there- 5 between to form a Verticalseries of staggered ports in said furnace wall, refractory walls formingan external pre-combustion chamber having one side thereof registeringwith said furnace Wall ports, an opening formed in one of said 10chamber walls for the entry of high temperature air for combustion, andan elongated fuel burner nozzle arranged to discharge into said chamberthrough a chamber wall spaced from said furnace Wall and having avertical series l5 of staggered diverging discharge tips correspondingin elevation to said furnace wall ports and arranged out of the directpath of heat radiated from the furnace through said furnace wall ports.

4. In combination, a substantially vertical furnace wall having a row ofspaced substantially vertical cooling tubes associated therewith, andrefractory material arranged to close the intertube spaces, certain ofsaid cooling tubes being bent and refractory material omitted fromtherebetween to form a vertical series of .staggered ports in saidfurnace wall, refractory walls forming a pre-combustion chamber havingone side thereof registering with said furnace wall ports, an openingformed in one of said chamber walls for the entry of high temperatureair for combustion, a vertically elongated fuel burner nozzle arrangedto discharge into said chamber through the chamber wall opposite saidfurnace 3 Wall and having a vertical series of staggered divergingdischarge tips corresponding in elevation to said furnace wall ports andarranged out of the direct path of heat radiated from the furnacethrough said furnace wall ports, and means 4,0 for cooling said fuelburner nozzle.

. CHARLES E. LUCKE.

Cil

